Discussion
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- Question
Which of the following is a scalar quantity
Options- A. Displacement
- B. Electric field
- C. Acceleration
- D. work
- Correct Answer
- work
- 1. Why does'nt the hydrogen atom emit X-rays?
Options- A. It is very small in size
- B. It has only one electron
- C. Its energy levels are very close to each other
- D. it is highly electropositive Discuss
- 2. Light year is a unit of
Options- A. time
- B. speed of light
- C. distance
- D. mass Discuss
- 3. Which metal is the best conductor of heat?
Options- A. Silver
- B. Gold
- C. Copper
- D. All of the above Discuss
- 4. Friction can be reduced by changing from
Options- A. Static to Dynamic
- B. Rolling to Sliding
- C. Dynamic to Static
- D. Sliding to Rolling Discuss
- 5. Electrical Pressure is also called
Options- A. Current
- B. Voltage
- C. Resistance
- D. Power Discuss
- 6. Distance of stars are measured in
Options- A. Galactic unit
- B. seller mile
- C. Cosmic Kilometre
- D. Light year Discuss
- 7. Which law is also called law of inertia ?
Options- A. Newton first law
- B. Newton second law
- C. Newton third law
- D. All of above Discuss
- 8. A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is moving:
Options- A. forward and loosing speed
- B. forward and gaining speed
- C. forward and uniform speed
- D. backward with uniform speed Discuss
- 9. Which component of an IED creates an electrical charge?
Options- A. activator
- B. fuse
- C. explosive
- D. power source Discuss
- 10. The purpose of choke in tube light is
Options- A. Induce high voltage
- B. Induce low resistance
- C. Induce high resistance
- D. Induce low voltage Discuss
Physics problems
Search Results
Correct Answer: Its energy levels are very close to each other
Explanation:
For an atom to emit X-rays it should have difference in energy levels
Correct Answer: distance
Correct Answer: All of the above
Explanation:
Silver is the best conductor of both heat and electricity among metals with a thermal conduction value of about 430 W/(mK).
Gold and copper both come respectably close to silver.
Copper being significantly less costly it is often chosen over silver in many applications.
Correct Answer: Sliding to Rolling
Explanation:
Any object rolls when there is no friction. So, Sliding to Rolling is correct.
Correct Answer: Voltage
Explanation:
Electrical Pressure is also called as Voltage. Voltage is measured in Volts.
Volt : A unit of electrical pressure or Voltage is called Volt.
One volt is the amount of pressure required to cause one ampere of current to flow against one ohm of resistance.
Voltage is also referred to as Electromotive Force or Electrical Potential or Electrical Pressure.
Correct Answer: Light year
Correct Answer: Newton first law
Correct Answer: forward and gaining speed
Correct Answer: power source
Explanation:
The power source such as a Battery of an IED creates an electrical charge.
What are IED's ::
An Improvised Explosive Device (IED) is a bomb constructed and deployed in ways other than in conventional military action. It may be constructed of conventional military explosives, such as an artillery shell, attached to a detonating mechanism. IEDs are commonly used as roadside bombs.
Correct Answer: Induce high voltage
Explanation:
When the switch is ON, in a tube light choke is nothing but the coil/ballast ( inductor) which is used to induce the high voltage across it. as we know that inductor has property to induce high voltage for the brief period of time, this high voltage is required to ionize the gases in the starter.
Then gas inside the starter gets ionized due to this full voltage and heats the bimetallic strip that is caused to be bent to connect to the fixed contact. Current starts flowing through the starter. Although the ionization potential of the neon is the little bit more than that of the argon but still due to small electrode gap high voltage gradient is appeared in the neon bulb and hence glow discharge is started first in a starter.
As voltage gets reduced due to the current causes a voltage drop across the inductor, the strip cools and breaks away from the fixed contact. At that moment a large L di/dt voltage surge comes across the inductor at the time of breaking.
This high valued surge comes across the tube light electrodes and strikes penning mixture (mixture argon gas and mercury vapor).
Gas discharge process continues and current gets the path to flow through the tube light gas only due to low resistance as compared to the resistance of starter.
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